Geology, Sediments and Soils

Valle, Pedro F. Zárate-del; Michaud, François; Parron, C.; Solana-Espinoza, Gabriel; Israde-Alcántara, Isabel; Ramírez-Sánchez, Hermes Ulises; Fernex, F.

doi:10.1007/978-1-4615-0545-7_2

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…The JTJ is characterized by active volcanism, seismicity and by paleo-and modern geothermal activity. The JTJ neotectonics are due to the motion of the Cocos Plate relative to the North America Plate (Venegas et al 1985;Barrier et al 1990; Allan et al 1991;Zárate-del-Valle et al 2002;Zárate-del-Valle and Simoneit 2005a, b;Michaud et al 2006).…”

Section: Study Areamentioning

confidence: 97%

“…The watershed (*54,000 km 2 ) comprises the Lerma River (*500 km) and Lake Chapala, the largest freshwater lake in Mexico and the third largest lake in Latin America (de Anda et al 1998). The lithology of the Lerma-Chapala watershed has been described elsewhere (Ferrari et al 1997(Ferrari et al , 2000Zárate-del-Valle et al 2002). It consists of Upper Miocene to Plio-Quaternary volcanic (mainly andesitic composition) and continental sediments belonging to the PlioQuaternary Trans-Mexican Volcanic Belt, which hosts some other neotectonic and volcanic lakes in central Mexico (Fig.…”

Section: Study Areamentioning

confidence: 99%

“…The Citala rift, including Lake Chapala, is characterized by evidence for paleo-and active hydrothermal activity as follows: (1) three types of thermal springsinland, nearshore and offshore (sublacustrine), (2) fossil carbonate sinter deposits, (3) hydrothermal alteration halos, (4) geyser activity, (5) gas seeps, (6) hydrothermal petroleum as two tar islands (Fig. 1c), and (7) mud volcanos (Zárate-del-Valle et al 2002).…”

Section: Geothermal Datamentioning

confidence: 99%

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Radiocarbon age inversions and progression: source and causes in Late Holocene sediments from Lake Chapala, western Mexico

Zárate-del-Valle

Ramírez-Sánchez

Fernex³

et al. 2010

Environ Earth Sci

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The results of eight radiocarbon datings of Lake Chapala sediments (site T46) are presented, the age inversions (AI) observed and their age progression discussed. As deduced from some AIs and the 210 Pb activity (site CHP4), the bioturbation zone in the lake varies over a depth of 5-25 cm. The linear sedimentation rates (LSRs) calculated from 14 C ages do not match the LSR calculated from unsupported 210 Pb activity for the upper sediments. This demonstrates the usefulness of dating sediments with complementary radiometric techniques such as short-lived isotope counting (SLIC), i.e., 210 Pb and 137 Cs. This approach leads to the following conclusions: (1) The incorporation of detrital particles with ancient carbon into the sedimentary column of the lake occurred by a combination of: (a) the presence of outcrops of hydrothermal petroleum with ages [40 ka (ka = thousands of years) in the lake, and (b) mass transport due to the presence of two elongated gyre circulation patterns integrated by cyclonic circulation (counterclockwise) in the north portion of the lake and anticyclonic circulation in the southern part. (2) Consequently, the 14 C ages of shallow lake sediments have geologic ages one order of magnitude greater compared to their ages determined by the 210 Pb method. (3) A bioturbation mechanism is not necessary to explain the 14 C AI in the top 70 cm and from 110 to 150 cm depth of the sediments. (4) According to the biological proxies data for the last 600 years B.P., the paleoclimate at Lake Chapala has changed from sub-humid to dry environmental conditions, and eutrophication has increased over the past 100 years due to local input from ongoing agricultural activities.

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Section: Study Areamentioning

confidence: 97%

Section: Study Areamentioning

confidence: 99%

Section: Geothermal Datamentioning

confidence: 99%

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Radiocarbon age inversions and progression: source and causes in Late Holocene sediments from Lake Chapala, western Mexico

Zárate-del-Valle

Ramírez-Sánchez

Fernex³

et al. 2010

Environ Earth Sci

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Modeling cadmium concentration in water of Lake Chapala, Mexico

Hansen

Afferden

2004

Aquat. Sci.

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Watershed management in Mexico is generally carried out based on hydrological information, whereas water quality data are mainly used in the control of wastewater discharges and water uses. Information on toxic contaminants is scarce and expensive to gather. A method was developed to predict inorganic contaminant concentration in Lake Chapala, Mexico, by using hydrological data for water balance, water quality information and analyses, sediment quality monitoring data, and ap- Aquatic Sciencesplying a chemical equilibrium model to estimate the possibility of increase in cadmium concentration. It is shown that decreasing water levels in Lake Chapala can lead to a significant increase in dissolved cadmium that, in the future, may affect the lake ecosystem and the water quality for different uses. Watershed managers can use this method with one by van Afferden and Hansen (2004) as an early warning system to reduce the risk that contaminant concentrations increase in the lake.

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